What is the purpose of CSS property prefixes?

Function: Let browsers support a new CSS property in advance before it becomes a standard. W3C is very slow to formulate standards; and browser vendors are short on marketing time. If an attribute is mature enough, support will be added to the browser; in order to avoid future changes when W3C publishes standards, a private prefix is ​​added. to support new properties in advance.

Students who have used CSS3 properties know that CSS3 properties need to be prefixed by each browser. Even now, there are still many properties that need to be prefixed. .

Browser manufacturers have been implementing CSS3 before, but it has not yet become a true standard. For this reason, some CSS3 style syntaxes provide browser-specific prefixes while they still exist. The main popular browser kernels now include:

• Trident kernel: the main representative is IE browser

• Gecko kernel: the main representative is Firefox

• Presto kernel: the main representative is Opera

• Webkit kernel: the main representatives are Chrome and Safari

For browsers with different cores, CSS3 attributes (some attributes that need to be prefixed) need to be added with different prefixes, which are also called private prefixes of the browser. The CSS3 attributes after adding the private prefix can be said It is a private property corresponding to the browser:

• Trident kernel: the prefix is ​​-ms

• Gecko kernel: the prefix is ​​-moz

• Presto kernel: The prefix is ​​-o

• Webkit kernel: The prefix is ​​-webkit

CSS The role of attribute prefix

Browser private prefix is ​​the browser’s early support for new CSS attributes.

In order to be compatible with the writing method of the old version. For example: Newer versions of browsers support writing directly: border-radius.

-moz represents the private properties of the Firefox browser, -ms represents the private properties of the IE browser, and -webkit represents the private properties of Safari and Chrome.

Because the W3C, the organization that formulates HTML and CSS standards, is very slow.

Usually, when a member of the w3c organization proposes a new attribute, such as rounded border-radius, everyone thinks it is good, but when w3c develops standards, it requires very complicated procedures, reviews, etc. Browser vendors have tight marketing time. If an attribute is mature enough, support will be added to the browser.

To avoid future changes when w3c publishes standards, add a private prefix, such as -webkit-border-radius, to support new attributes in advance.

Wait until w3c announces the standard in the future and the standard writing method of border-radius is established, then the new version of the browser will support the border-radius writing method.

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